Crust enough oreos (usually about 1/2-3/4 package) to coat the bottom of the pan (use a food processor...it's WAY easier). Mix with 1/4 c of melted butter (or more if necessary) to make sticky. Press to bottom of pan.
Cut ice cream into even slices, lay on top of cookies. Top with fudge topping (which you will generally have to heat a bit to soften) and spread with cool whip. Sprinkle more broken up oreos on top. Freeze to solidify. Serve.